Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L13/00—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints
  • F16L13/14—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
  • F16L13/141—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling by crimping or rolling from the outside
  • F16L13/143—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling by crimping or rolling from the outside with a sealing element placed around the male part before crimping or rolling
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L13/00—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints
  • F16L13/14—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
  • F16L13/148—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling specially designed to ensure an intended leakage until correct deformation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose-connectors, i.e. single members engaging both hoses
  • F16L33/20—Undivided rings, sleeves, or like members contracted on the hose or expanded inside the hose by means of tools; Arrangements using such members
  • F16L33/207—Undivided rings, sleeves, or like members contracted on the hose or expanded inside the hose by means of tools; Arrangements using such members only a sleeve being contracted on the hose
  • F16L33/2071—Undivided rings, sleeves, or like members contracted on the hose or expanded inside the hose by means of tools; Arrangements using such members only a sleeve being contracted on the hose the sleeve being a separate connecting member
  • F16L33/2073—Undivided rings, sleeves, or like members contracted on the hose or expanded inside the hose by means of tools; Arrangements using such members only a sleeve being contracted on the hose the sleeve being a separate connecting member directly connected to the rigid member
  • F16L33/2075—Undivided rings, sleeves, or like members contracted on the hose or expanded inside the hose by means of tools; Arrangements using such members only a sleeve being contracted on the hose the sleeve being a separate connecting member directly connected to the rigid member by quick acting

Definitions

• the invention relates to a press connection between a fitting and a cold-deformed pipe end pushed onto the fitting, with a sealing ring which is inserted into a groove on the outside of the fitting and is elastically deformed by the pipe end.
• Connections of this type have long been known for water pipes in the sanitary area.
• DE 298 13 935 discloses an inseparable press connection between a sleeve and a metal pipe end, in which the sealing ring is inserted into a groove in the sleeve. After inserting the pipe end to be connected into the sleeve, there is a leak that is closed after the sleeve is pressed.
• This leak is intended to ensure that an inadvertently uncompressed sleeve is identified due to the leak at the leak.
• the leak is reached with a sealing ring that has a special non-circular contour.
• Such sealing rings have to be specially manufactured and are therefore comparatively expensive.
• EP 0 513 292 B1 discloses a press connection between a double fitting and pipe ends pushed onto it. A leak is not intended for this connection. If a pipe end is accidentally not pressed, the fitting can still be tight under normal water pressure, so that a missing press is not initially recognized. If the water pressure increases, the fitting will leak and a high level of structural damage can occur. This connection can also cause a leak if a pipe end is not carefully deburred and therefore the sealing ring or the sealing rings get injured. Here, too, there is a risk that such a leak will only develop later after pressure fluctuations in the line.
• the invention is based on the object. To provide a press connection of the type mentioned which offers greater security, but is still simple and! is inexpensive to manufacture and assemble.
• the sealing ring can be designed as usual, ie it can have a circular cross section. Due to the mentioned difference in the diameters, the sealing ring is not touched by the pipe end to be connected by this, at least in some areas. A non-deburred end face can therefore not damage the sealing ring, which applies if the sealing ring has a smaller outer diameter over its entire circumference. If the pipe end is accidentally not pressed, there is a leak between the outside of the sealing ring and the inside of the unpressed pipe end.
• the invention also relates to a particularly suitable press tool for producing the press connection according to claim 1.
• the two press jaws of this press tool each have a first contour for guiding the press jaws on a collar of the fitting and a second contour for cold-forming the pipe end in the region of the sealing ring.
• a third contour for cold-forming the pipe end is preferably provided at the free end of the fitting.
• FIG. 1 shows a longitudinal section through a press connection, an upper half showing a pipe end that has not yet been pressed and a lower half showing a pressed pipe end
• FIG. 2 shows a cross section through a variant of the press connection, but the pipe end has not yet been pressed
• Figure 3 is a section along the line III-III of Figure 2 and
• the press connection has a fitting 2, only half of which is shown.
• the half not shown can also be designed for a press connection. However, it can also have a thread, for example, or be part of a fitting.
• the fitting 2 consists, for example, of plastic or metal and has a collar 2f and a shoulder 2e as a stop for a cut surface le of an end la of a pipe to be connected.
• a circumferential groove 2g is arranged between the collar 2b and the cut surface 2e, into which a press sleeve 5 engages with an inwardly directed edge 5a.
• the edge 5a is preferably snapped into the groove 2g.
• the compression sleeve 5 can be preassembled on the fitting 2.
• a circumferential groove 2a is worked into an outer side 2h of the fitting 2, into which a sealing ring 3 with a circular cross-section is inserted.
• the outside diameter d of this sealing ring 3 is smaller than the inside diameter D of the tube 1.
• This outside diameter d is also smaller than the outside diameter E of the surface 2h.
• the groove 2a is delimited by two ribs 2b, each of which adjoins a depression 2c.
• the groove 2a is thus between two depressions 2c and two immediately adjacent ribs 2b. As can be seen, these ribs 2b are designed such that the sealing ring 3 projects radially beyond them.
• the tube 1 is made of a cold-formable material.
• the tube 1 is a composite tube with a middle layer made of aluminum. Such tubes 1 are known per se.
• the pipe end la is pushed onto the fitting 2 until the end face le rests against the shoulder 2e.
• the pipe end 1 a is centered on the fitting 2 by this system and the guidance of the surface 2 h.
• the compression sleeve 5 is preferably preassembled. The pipe end la is thus inserted into the compression sleeve 5. If the pipe end 1 is centered on the fitting 2, the compression sleeve 5 and the pipe end 1 a are plastically deformed.
• the pressing jaws of the pressing tool 4 are each guided with a contour 4a on the collar 2f.
• Important contours 4c press the pipe end 1 a and the compression sleeve 5 in the area of the sealing ring 3.
• a central circumferential area 1 b * elastically deforms the sealing ring 3.
• Neighboring areas 1 c 4 are deformed such that they each engage in a recess 2 c and thus fix the pipe end 1 a to the fitting 2.
• the deformation of the sealing ring 3 is limited by the adjacent ribs 2d. This prevents the sealing ring 3 from being plastically deformed beyond the elastic range.
• a plastic deformation of a sealing ring 3 is unfavorable and affects the tightness.
• the compression sleeve 5 improves the fixation of the pipe end 1 a to the fitting 2. In principle, however, a connection without such a compression sleeve 5 is also conceivable. Further contours 4b press the compression sleeve 5 and the pipe end 1 in the area of the recess 2d. The pressed area ld 'engages in this recess 2d and increases the strength of the connection.
• a fitting 20 is provided, into which a groove 21 is incorporated.
• a sealing ring 22 is inserted into the groove 21 and also has a round cross section.
• the groove 21 has a groove base 21a which is not round in cross section according to FIG. 2.
• the groove base 21a has a flattened region A in the region of the angle ⁇ , which is approximately 90 °. Outside this area A, the groove base 21a can have a circular cross section.
• the flattening of the groove base 21a in area A has the result that the sealing ring 22 according to FIG.
• the leakage 24 is a passage between the sealing ring 22 and the inside 25 of the pipe 1. If the pipe 1 is not pressed, water escapes through the leakage 24 when the line is started up, so that it can be seen already when the pipe is started up that the pipe 1 was not pressed and thus there is no tight connection. The pipe 1 can then be pressed and thus the leakage 24 can be eliminated.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
• Coupling Device And Connection With Printed Circuit (AREA)
• Flanged Joints, Insulating Joints, And Other Joints (AREA)
• Mechanical Coupling Of Light Guides (AREA)
• Joints With Sleeves (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=27626677

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (15)

Family Cites Families (7)

• 2003
  • 2003-01-21 AT AT03700282T patent/ATE326659T1/de active
  • 2003-01-21 DE DE50303361T patent/DE50303361D1/de not_active Revoked
  • 2003-01-21 EP EP03700282A patent/EP1470356B1/fr not_active Revoked
  • 2003-01-21 DK DK03700282T patent/DK1470356T3/da active
  • 2003-01-21 WO PCT/CH2003/000038 patent/WO2003064912A1/fr not_active Ceased

Non-Patent Citations (1)

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